Question about 1999 Buick Century

Open Question

Loss of radiator fluid in cold weather...

1999 Century - 42,000 miles - Extreme loss of radiator fluid in sub-zero weather to the extent that it needs to be topped up every 30 miles or so driven (Maybe 12 -16 ounces lost each time). Absolutely no loss of radiator fluid when the temperatures remain day and night above freezing. No visible leaking of fluid (from the rad, the hoses, etc.), no sign of fluid in the engine oil, no smell of burning radiator fluids.

Interesting note: Even when freshly topped in cold weather, quick acceleration might activate the low coolant warning on the dashboard. Help?

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 11896 Answers

SOURCE: 97 buick lasabre trans slips in overdrive

Either the cruise control is going out or the torque converter clutch circuit is going out on the trannys overdrive. Do you have check engine light codes? If so you will need to have a computer hooked up to read them. Darrel coleman also has a problem with his car like this and I have suggested the same thing to him

Posted on Apr 21, 2009

  • 42 Answers

SOURCE: my trans fluid is mixing with my radiator fluid, what can i do.

I hate to contradict the prior poster, but I would not see how a blown head gasket could get transmission fluid into the radiator. Motor oil, yes, but transmission fluid, no.

the transmission fluid in your tranny runs out of the transmission and up into the radiator to cool it off.

So if there is transmission fluid in the radiator, I'd look for a leak in the radiator. If it is mixing the two fluids then the leak is probalby internal.

Remember that if the radiator is now 'mixing' water and transmission fluid, there is a possibility that the fluid/water mixture may be going back into the transmission as well

Posted on May 16, 2009

  • 34 Answers

SOURCE: Suburban overheating and losing transmission fluid? Please help..

it could be a bunch of thngs but i would guess its the lower intake manifold.

Posted on Jul 17, 2009

  • 1124 Answers

SOURCE: I have a 2001 Buick Century. I just had my

One good way to find where a coolant leek is coming from - is - when you get home and the car is good and warmed up - "hot".. Park it up on ramps if you have them.. Right after you shut it off - it will build even more pressure in the cooling system.. At this time car is off - open the hood and look (from under the hood and from under the car if you have ramps) for leeks,, listen for the "hissssss".. If the leek is just to small and/or to difficult to find - take it to a shop or oil change place for a compression test of the cooling system to locate the leek..

Hopefully its just a hose leek..

Good luck..

Posted on Sep 23, 2009

  • 1 Answer

SOURCE: oil mixing with coolant

If this is a 3800, Upper Intake Plenum or Lower intake gaskets are an inevitability. Head gaskets on these engines rarely go out! Seriously, don't get duped. I am doing the job on my grand prix right now. Google it for further explanation.

Posted on Oct 19, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2010 Dodge journey overheating

There is no magic bullet fix.
Check the following:
  1. Coolant level and quality. Replace old coolant with 50/50 blend of ethylene-glycol coolant and FILTERED water;
  2. Stuck or obstructed thermostat;
  3. Clogged radiator;
  4. Fluid loss from leaks;
  5. Bad radiator cap;
  6. Failed water pump;
  7. Failed fan clutch or electric fan circuit;
  8. Obstruction to front grille, preventing air from flowing;
  9. Worn engine with low output;
  10. Extreme operating conditions requiring larger radiator.

May 11, 2015 | Dodge Cars & Trucks

1 Answer

Turning over hard in extreme cold weather

Could you be using the wrong grade oil for your weather conditions? If not, likely bad starter motor, battery cables or grounds.

Feb 21, 2015 | Cars & Trucks

2 Answers

What causes 02 buick century that not running hot to show the guage hot and the fan running and temp light to show

1 How do you know it is not running hot? Engines run normally at close to 90 deg. C, that is, close to the boiling point of water. The pressure cap on the radiator ensures that the water does not steam off at this temperature.
2 If the engine is not running hot and the gauge shows that it does, the gauge is faulty, probably the sender unit. I am not sure of the Buick, but some cars have two senders, one for the gauge on the dash and the other for the radiator fan. If your car has only one, the information from the sender is probably used by the ecu to switch on the fan, so if the sender is faulty you will get the symptoms you describe.

Feb 10, 2015 | Buick Cars & Trucks

1 Answer

What causes coolant loss in the radiator of a 1999 hyundai accent? what causes coolant loss in the radiator of a 1999 hyundai accent? the coolant does not leak out of the radiator but coolant level is...

Possible bad head gasket or cracked cylinder head.Check your oil and make sure there is no coolant mixed in. Have it checked at a reputable mechanic. Also check front passenger side carpet for heater core leak.

Jun 05, 2014 | 2004 Hyundai Santa Fe

1 Answer

I have a oil leak looks like its comeing from the back of the engine somewere at the bottom

The problem is with rubber seals at the entry of each plug causing oil to leak to the engine. What you need is new ones. Check the plugs affected and replace them too. By the way, oil leak to the engine will make the sub' to have a power loss of upto about 50% in an extreme case the car will refuse to start while cold!

Jun 30, 2010 | 1999 Subaru Impreza

1 Answer

Takes a extreme amount of time to "warm up" when starting in cold weather. Spits and spurts for a number of miles during cold weather starts. Problem does not appear when the outside ambient temp is very...

very likely to be the thermostat needs replacing(to test,wrap a piece of cooking foil around the radiator/front grill and see if the heatup time is less,if it is, then its the thermo.) easy,yes.....

Jul 02, 2010 | 1994 Lincoln Town Car

1 Answer

My '94 Ranger (166K miles) leaks transmission fluid but only seems to in hot weather and stop and go traffic. I drove 200 highway miles last weekend in 80 degree weather with no fluid losses. What gives?

Your transmission is either overfilled or cooler sounds like it is plugged and not letting your fluid cool properly causing it to foam and run out the vent. I would recommend first checking your fluid with the engine running and in park to insure proper levels then if that looks good pulling the transmission lines from the radiator and blowing air through it to clear any trash that may of accumulated. You can even purchase an external cooler to help cool your fluid just be sure that when you install it to make sure you install it after the radiator or the side that your fluid returns back to the tranny and not before the radiator.

Jul 18, 2009 | 1994 Ford Ranger Supercab

2 Answers

Low coolant light, temp normal

try adding it via the reservoir. make sure you have a 50/50 mix of water and antifreeze. If you want to cheat, cheat on the side of more antifreeze than water. Look for a leak in the hoses and water pump to find out if she has a larger problem that is causing the loss of coolant. look for drips under the car.

Jan 26, 2009 | 1998 Buick Century

1 Answer

Replace the Camshaft for 1999 Chev Sub

Usually you will need to replace to Cam whenever you start losing Power Considerably. The Lobes on the Cam will wear down after so Many miles and will need to be Replaced. Not all that Unusual.If you have high miles and a Considerable loss of Power you need to have this done.

Jan 25, 2009 | Nissan Maxima Cars & Trucks

1 Answer

On cold days the engine quits, after driving 1 mile

Distributor Ignition Pickup may be defective, these are sensitive to temp changes, they will cause a loss of spark..

Dec 17, 2008 | 1987 Jeep Wrangler

Not finding what you are looking for?
1999 Buick Century Logo

Related Topics:

100 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

78238 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides